Machine for turning rings from tubes.



W. D. MITCHELL. MACHINE FOR TURNING RINGS PROM TUBES.

APPLICATION IILED'APB. 1, 1908.

Patented Oct. 26, 1909.

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ANDREW B4 GRAHAM co. vnvrc-umanmmus, wAsflmejloil. n. a

WILLIAM DONALD MITCHELL, F TORONTO, ONTARIO, CANADA.

MACHINE FOR TURNING RINGS FROM TUBES.

Specification of Letters Patent.

Application filed April 1, 1908.

Patented Oct. .26, 1909. Serial No. 424,572.

To all whom it may concern:

Be it known that I, IVILLIAM DONALD MITCHELL, a subject of the King ofGreat Britain, residing in the city of Toronto, county of York, Provinceof Ontario, Canada, have invented certain new and useful Improvements inMachines for Turning Rings from Tubes, of which the following is aspecification.

My invention relates to improvements in machines for turning rings fromtubes, whether the tubes be of metallic or nonmetallic substance; but Ihave particularly designed the species of my invention shown, andhereinafter particularly described, in order to reduce the cost ofmanufacturing celluloid rings.

Another object of my invention is to construct my machine so as toquickly and accurately adjust or position the cutters used to cut ringsof different thicknesses; and a still further object of my invention isto design my machine so that the cutter may be quickly thrown intoaction. I

The construction and operation of my preferred form of invention will behereinafter particularly described, and the parts I claim as new will bepointed out in the claims forming part of this specification.

Figure l is a perspective view of my preferred form of invention. Fig. 2is, in part, a side elevation of the mechanism for supporting andmanipulating the cutter. This View also shows a vertical longitudinalsection through the preferred form of holder for the tube; and thesupporting parts for the holder, and Figs. 3, 4, and are diagrammaticviews of the cutter showing the different positions of the same inturning a ring from the tube, the latter of which is partly shown insection.

In the draw1ngs,like characters of refer-. ence lndlcate correspondingparts in each figure.

In manufacturlng rlngs by means ofmy preferred form of invention,substantially only three operations are necessary; firstly,

stock, and thirdly, completing the severing of the ring from the stockby moving the said cutter in the desired direction around the saidconstant center. In machines now on the market for manufacturing ringsof this class, several more operations are necessary than are employedin my machine, and therefore it is very evident that I can greatlyincrease-the output of rings for any given time, and thus reduce cost ofmanufacture.

My preferred form of invention consists of a ,machine-bed A on whichoperates the longitudinal slide B which is operated by the usualscrew-spindle C -mounted in the said bed.

D is any suitable drive-pulley mounted in the standard E which is.supported by the bed A. The spindle F .(which is secured to, or formed apart of the shaft of the pulley D) may be of any suitable constructionso that the tube of stock G may be carried thereby and rotated.According to the construction shown for attaching the stock to thespindle I provide the outer end a of the spindle with a right handthread, and screw thereover one end of the stock G.

H is a standard carried by the longitudinal slide B, and sameis providedwith a central opening I. Carried by the standard H, is a rotarybearingering J, of any suitable construction,wh1ch is rotated by thestock-holder 2 mounted-therein.v The outer surface of the, stock-holder2-is preferably tapered, as shown at 3, to conform to the taperedformationof the central opening 4 of the bearing-ring J.

- 5 is a ring-nut provided with a flange 6 which partially overhangs thevertical face '7) of the stock-holder 2. The flange 7 of this ring-nutis internally threaded, and screws over the externally threaded shoulder8 of the bearing-ring J, thus holding the stock-holder within the saidbearing-ring and in such a manner that the said stockholder rotates thesaid bearing-ring.

, By means of the constructionjust described, it will be understood thatthe tightness of fit between the stock-holder 2 and bearing-ring J canbe adjusted.

As this machine is especially designed for the manufacture of rings fromtubes made of celluloid, it will be understood by one still I find itpossesses the advantage of being cheap and in every way suitable.Sometimes the wood shrinks, and 111 order to keep the stock-holdertightly jammed against the bearing-ring J, I provide the constructionbefore set forth, because the ring-nut 5 can be screwed up to jam thesaid stock-holder tightly within the said bearingring. I

Upon referring 'to Fig. 2 it will be seen that the stock-holder 2 andthe inner ends of its gripping fingers 14 are cut away so that for thecut-away area they will not come in contact with the tube of stock andso reduce very largely the possible friction generating surfaces betweenthe said stockholder and the said tube.

9 is a ring-nut, the horizontal flange 10 of which is internallythreaded and screws over the externally threaded portion of the standardH. The vertical flange 11 of the ring-nut 9 fits over portion of thebearingring J, thus retaining said bearing-ring in position within thestandard H. By means of the screw 12, or any other suitable means, thering-nut 9 is firmly secured to the standard H. Although ball bearings13 are shown so as to reduce the friction between the bearing-ring J andthe standard H and ring-nut 9, it will be understood that any suitableantifriction means may be used for this purpose without departing fromthe spirit of my invention. It will be also understood that I may useany suitable con struction for supporting the stock-holder by thestandard H.

As this machine is primarily designed to turn rings from a tube ofcelluloid, I have had to design special means to prevent frictionbetween the celluloid tube and the stockholder so as to positivelyeliminate any 'danger of fire.

It will of course be understood that where my invention is used forturning rings out of tubular stock in connection with the ma nipulationof which there is no danger of fire, it will not be necessary to beparticular as regards the elimination of friction between the tubularstock and its holder. For the purpose before set forth, the stockholder2 is integrally provided with a series of resilient gripping fingers 14,which firmly grip the stock G. I preferably, though not essentially,construct the stock-holder 2 out of wood, as I find this material givesme a good purchase on the stock.

The rotation of the spindle F rotates the stock Gr, and its holder 2.

15 is any suitable cross-slide which is operated by the usual lever 16,crosswise of the longitudinal slide B, and as this crossslide may be ofany suitable construction, a further description of the same isunnecessary. Pivoted to the cross-slide 15 by the stud 161 (the lowerend of which screws into the said cross-slide), is the cutterholder 17,which is provided with any suitable handle 18.

19 is the cutter held by any suitable means, such as the set-screws 20,on the extension 21 of said cutter-holder. Upon referring to thedrawings, it will be seen that the cutter 19 is supported so that theapex 22 of its cutting-end will be on a line with the center of thethickness of the wall of the tube G, as shown by the line 23 in Fig. '3;and that the axis of rotation of the stock will lie substantially. inthe plane of the cutter, (Fig. 2).

In Figs. 1, 2, and 3 the position of the cutter 19 in respect of thetube G is shown before the cutter-holder 17 is advanced. By suitablemeans (the preferred form of which I will hereinafter particularlydescribe), the cutter 19 is advanced into the position shown in Fig. 4thus shaping the end of the stock G as shown. By means of the handle 18,the cutter holder 17 is swung around the stud 16l, and so severs thering from the stock G as will be clearly understood on reference to Fig.5. The cutter holder 17 is then withdrawn sufficiently to permit of theremoval of thefinished ring. The cutterholder 17 is then swung back tonormal position, in which position it will be retained by means of thenose 25 of the spring 24;

(which spring is suitably securedto the crossslide 15) engaging with thenotch 26 formed in the base of said cutter-holder. By turning thehand-wheel 27 secured to one end of the screw-spindle C, the saidscrew-spindle is turned, thus feeding forward the longitudinalslide B,and, as a consequence advancing the cutter-holder 17 and the standard H,so as to feed the gripping fingers 14 over the stock. 7

In order to quickly adjust or position the cutter 19 in respect of thestock G in making the first cut, I use the following preferred means: 28is a disk secured near the outer end of the screw-spindle C, andprovided with a V-shaped periphery 29. Loosely mounted on thescrew-spindle C between the disk 28 and the hand-wheel 27, is an arm 30,down through the head 31 of which screws the rod 32, the lower end 33 ofwhich is designed to co-act with the V-shaped periphery 29 of the disk28 so as to turn the screw-spindle C. 34 is a bracket carried by the bedA, and same is provided with the stops 35 and 36 adjustable'thereon.Ordinarily, the rod 32 hasloose contact with the disk 28. In order toadvance the cutter 19 the desired distance, the said rod is thrown awayfrom the operator until 1ts stop 37 strikes the stop 36. The rod 32 isthen screwed tightly against the disk 38 and,

moved toward the operator until its stop 37 strikes the stop thismovement turns the screw-spindle G sufliciently to advance thelongitudinal slide so that the cutter-l9 will be positioned as beforedescribed for the first operation.

Of course my machine is designed to receive stock, the wall of whichvaries in thick ness, and so enable me to manufacture rings of differentthicknesses. In order to manufacture a ring having a thickness greaterthan that manufactured from the stock shown, I must remove the cutter l9and put in its place the proper sized cutter. In the species of myinvention shown, it is very necessary that I obtain quick and accuratepositioning or adjustment of the cutter, and in order to do this I havedesigned the following means: Secured to or formed a part of thecutter-holder 17 is an arm 38 provided with a hole 39, the center ofwhich is directly on a line with the center of the hole formed in thestud l6-l. Before placing the cutter in the cutter-holder 17, anadjusting pin (see dotted lines Fig. 2) is supported in the arm 38 andstud 16-1 by means of the holes therein. The diameter of this adjustingpin at the point where the cutting end of the cutter will aboutthereagainst will be such that the cutting end of the said cutter willaccurately fit thereagainst, thus enabling the cutter to be held in anadjusted position while the screws 20 fasten it in place. The adjustingpin is then removed, and the machine operated as before described.

hen I have increased. or decreased the size of the cutting end of thecutter, it will be understood that I must adjust the posit-ion of thestops 35 and 36 so as to obtain the desired movement of the cutter, andfor this purpose I have shown a plurality of holes 0 formed in thebracket 34 which permit the shifting of the stops 35 and 36.

By changing the stock-holder 2, it will be understood that tubes ofstock having various diameters may beheld by the standard H.

From the foregoing specification it will be clearly understood that inmy preferred form of invention the cutter must be placed, before it canmanufacture a ring from a length of tube, so that a line longitudinallybisecting the same will pass through the apex of its cutting end and beon a line with,

the center of the wall of the tubular stock, and that the axis ofrotation of the stock will lie substantially in the plane of the cutter,(Fig. 2). If the cutter be raised above the position shown in Figs. 1and 2, it will have to be adjusted, as before set forth, as will bereadily understood by one skilled in this art.

While I have described what I consider to be the best embodiment of myinvention,

essentially operating beyond the end of said rotary stock-holder; acutter-holder; a movable support; means by which said cutterholder ispivoted to said movable support; the said cutter being held by the saidcutterholder so that a line passing longitudinally through the cutterand bisecting its recessed cutting end will be on a line with the centerof the thickness of the tube of stock to be turned, and at one side ofthe axis of rotation of the same, and that the axis of rotation of thestock will substantially lie in the same plane as the cutter and itsrecessed cutting end being supported so that the center thereof Will bedirectly above the center of the pivotal means for said cutter holder,and means whereby said movable support is advanced in a straight line.

' 2. In a machine of the class described, the combination of a membermovable longitudinally; a rotary work-holder carried by said member; amember movable transversely of said firstanentioned member; a cutterprovided with a concaved cutting end essentially operating beyond theend of said rotary stock-holder; a cutter-holder; a movable support;means by which said cutterholder is pivoted to said movable support; thesaid cutter being held by the said cutterholder so that a line passinglongitudinally through the cutter and bisecting its recessed cutting endwill be on a line with the center of the thickness of the tube of stockto be turned, and at one side of the axis of rotation of the same, andthat the axis of rotation of the stock will substantially lie in thesame plane as the cutter, the concaved cutting end of said cutter beingsupported so that the center thereof will be directly above the centerof the pivotal means for said out ter-holder, and means whereby saidmovable support is advanced in a straight line.

3. In a machine of the class described, the combination of a rotarystock-holder; a cutter provided with a recessed cutting end essentiallyoperating beyond the end of said rotary stock-holder, and positioned sothat a line passing longitudinally through the recessed cutting end ofsaid cutter will be on a line with the center of the thickness of thetube to be turned, and at one side of the axis of rotation thereof meansfor giving one of said elements movement in a straight line parallel tothe longitudinal axis of said r0- tary stock-holder so that the saidcutter will, during this movement, partially manufacture a ring from theend of the tubular stock projecting beyond said rotary stock-holder, andmeans whereby one of the two first-mentioned elements is moved around aconstant pivotal point so that the said cutter may complete themanufacture of the partiallyt'ormed ring and sever it from said stock.

4. In a machine of the class described, the combination of a rotarystock-holder; a cutter provided with the recessed cutting end operatingbeyond the end of said rotary stock-holder; a pivoted support holdingsaid cutter so that a line passing longitudinally through the recessedcutting end of said cutter will be on a line with the center of thethickness of the tube to be turned, and at one side of the axis ofrotation thereof and the pivotal axis of said support will pass throughthe center of the recess in the cutting end of said cutter, and meansWhereby said support is advanced so as to carry the cutter in a straightline. a

5. In a machine of the class described, the i the center of the pocketin the said stud, and

a cutter-seat the central line of which intersects the axis center lineof said stud.

In testimony whereof I have signed my name to thisspecification, in thepresence of two subscribing witnesses.

WILLIAM DONALD MITCHELL.

Vitnesses M. S. JORDAN, N. LANGFIELD.

